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Composite diaphragm with high-temperature thermal shrinkage resistance and compression elasticity

A composite diaphragm, compressive elasticity technology, applied in the direction of separator/film/diaphragm/spacer element, structural parts, electrical components, etc., can solve the problems of high thermal shrinkage rate and insufficient battery safety, and achieve amortized cost and The effect of reducing energy costs

Pending Publication Date: 2022-02-11
北京沐昱新能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The traditional wet-process PE base film plus ceramic coating composite separator or dry-process single-drawn PP separator has a large thermal shrinkage rate at a high temperature of 140°C; the safety of the battery is not enough

Method used

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Embodiment 1

[0021] Under understanding the spirit of the present invention, the material formula and organizational structure of the present invention can be combined in different ways, for example, the following formula combinations can be adopted: a composite diaphragm with high temperature resistance, heat shrinkage and compression elasticity, the total thickness of the composite diaphragm is between 22-24 microns, mainly including (A) / (B) two layers, oil-containing base film with compressive elasticity and high strength in a wide temperature range from minus 30°C to high temperature 70°C as (A) layer, (A) layer The thickness is between 11-12 microns; the microporous layer of ultra-fine fiber melt-blown cloth with low heat shrinkage at 140°C is used as the (B) layer, and the thickness of the (B) layer is between 11-12 microns, and the (B) layer The porosity is between 60% and 70%; the composite diaphragm is clamped between the positive pole piece and the negative pole piece, a pressure ...

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Abstract

The invention provides a high-performance economical composite diaphragm which has a low thermal shrinkage rate at a high temperature of 140 DEG C; and the invention discloses the novel composite diaphragm which can adapt to volume expansion and shrinkage of a negative electrode material within a wide temperature range from -30 DEG C to 70 DEG C, has compression elasticity and is economical, as well as amanufacturing method thereof. The total thickness of the composite diaphragm is 14-40 microns, and the composite diaphragm mainly comprises a layer (A) and a layer (B), wherein an oil-containing base film with compression elasticity and high strength in a wide temperature range is used as the layer (A), and the thickness of the layer (A) is 8-20 microns; and the superfine fiber melt-blown cloth microporous layer with low thermal shrinkage rate at the high temperature of 140 DEG C is used as a layer (B), the thickness of the layer (B) is 6-20 microns, and the porosity of the layer (B) is 50-77%.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, in particular to key diaphragm materials used in power batteries and energy storage batteries. Background technique [0002] Due to its high energy density and no memory effect, lithium-ion batteries are widely used in mobile phones, notebook computers, electric vehicles, energy storage and other fields. At present, power batteries used as mobile energy and energy storage batteries used in fixed positions are required to improve cycle life and security. [0003] In order to increase the energy density of power batteries or energy storage batteries produced by some enterprises, nanowires or nanoparticles of silicon-based materials are mixed into the negative electrode active material of the battery cell. Due to the huge volume expansion of silicon-based materials during charging, There are often micro-short circuits formed by partial micro-piercing of the diaphragm, which affects the self-dis...

Claims

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Application Information

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IPC IPC(8): H01M50/40H01M50/403H01M50/451
CPCH01M50/40H01M50/403H01M50/451Y02E60/10
Inventor 李鑫顾阳光吉学文
Owner 北京沐昱新能源科技有限公司